This would be a new Wither Skeleton variant, that has an 'active' blue Wither Skull on their head.
When they spot the player, they start running towards them, while their head locks onto them, and starts flashing.
If the player doesn't leave their line of sight (which is 32 blocks), they will shoot their head towards the player, which explodes on impact.
After that they are headless, and will attack the player without any weapons, only punching using their arms.
Oh, and they have a chance to drop a wither skull just like the normal ones, but the drop comes from the skull explosion.
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